👉 In the context of fluid dynamics, an instance fluid refers to a substance that can exist in multiple phases (solid, liquid, or gas) under varying conditions of temperature and pressure, but it maintains a distinct identity and structure throughout. Examples include water, which can transition between ice (solid), liquid (water), and steam (gas) without losing its unique molecular characteristics. This concept is crucial in understanding natural phenomena like weather patterns, ocean currents, and the behavior of materials under different environmental conditions.
